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<h1>exec</h1>
<p>Executes a program. </p>
<h2>parameters:</h2>
<ol>
  <li>The filename of the program to be run</li>
</ol>
<p>The program file
must be in the prgs subdirectory of calc#. Program files are simple text files
which contain calc# instructions. Comments can be added to the program files.
A whole line can be commented with the ; mark at the beginning of the row.
The rest of the parameters are passed to the program as arguments. The first
argument can be accessed as $1 and so the others. These arguments are passed
trough the main memory, so if you set a variable as $1 it's value will be
overwritten at the execution and will be erased  at the end of the program.</p>
